The executive producer of NCIS has revealed that the final two episodes of the season will have a big impact on the characters.

Speaking to TV Line, Gary Glasberg explained that viewers might be surprised when the identity of the Port-to-Port killer is revealed.

"He's been hinted at here and there," he said. "There are elements that have come up. It will be a surprise and yet a revelation for people.

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"Throughout the finale there are going to be a number of 'a-ha' moments. It's very multi-layered and not only wraps up the Port-to-Port story but also a lot of other loose ends that have come up. People will hopefully be excited by it."

Glasberg also hinted that not all of the characters will survive the season finale.

"I won't give you raw numbers, but I will say there is a significant loss that happens for the team - and there is probably more than one," he said. "What happens in this week's episode and the finale will absolutely rock the world of NCIS.

"There is tremendous emotional resonance that happens from the losses they experience over the next two episodes - and that resonance will be felt well into next season. I have no doubt."